The route of the William Tell Express links central Switzerland with Ticino, the country's Italian speaking region. Starting at Flüelen, the train speeds through the valley of the upper Reuss, surrounded by peaks and cliffs which dominate the scenery on this section of the line.
As the line passes through Wassen, the railway climbs 634 metres over the next 20 miles. This is achieved by incorporating a series of horseshoe curves into the mountain side, and the unforgettable architectural masterpiece of the spiralling Gotthard Tunnel. On emerging from the tunnel, the route passes into the Italian-speaking region of Switzerland. From here, the line begins its descent, almost as sharply as it climbs on the other side. On this stretch of the railway, we can see vines, as well as the long waterfall at Biasca. As we continue our descent, we pass a clutch of three medieval castles in close succession, shortly before arriving in Ticino.